The device can be used both as a line coupler and as an area coupler. As a line coupler, it connects a KNX line with the main line. As an area coupler, it connects a main line with an area line. The respective lines are galvanically separated. The telegrams that pass through the coupler can be determined using a filter table (8k bytes). The main line and the subordinate line are connected via a bus terminal. The device is powered via the KNX bus and does not require any additional power supply. The LEDs on the front of the device visualize operating states and communication errors on the KNX. The telegram filter can be deactivated as a test using the buttons. Sales unit: 1 ST.